ABB SPAJ140C Over Current and Earth Fault Relay
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DESCRIPTION |
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Auxiliary supply: 24-250 V AC/DC, 45-65 Hz, <10 VA / 5 W |
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CT inputs: 1 A or 5 A, 50/60 Hz, burden <0.1 Ω |
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Curves: IEC 60255 IDMT (SI, VI, EI) or definite-time |
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Outputs: 3 fast electro-magnetic relays, 8 A 250 V AC, <15 ms |
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Display: 2×16 char. LCD + 4 push-buttons |
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Mounting: 1/4 × 19" rack, 122 mm wide |
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Isolation: 2 kV RMS, IEC 60255-5 |
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APPLICATIONS |
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Feeder protection in 10 kV urban rings—IDMT curves give 0.1 s selectivity between incoming and outgoing breakers, cutting outage area to a single city block when a cable fault occurs. |
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Steel-plant EAF cable protection—high-set I>>> element trips in 40 ms on 12 kA furnace short-circuits, preventing transformer fire and limiting electrode damage to <20 mm tip burn-off. |
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Photovoltaic collector lines—wide 24-250 V AC/DC supply rides through inverter voltage swings; earth-fault block detects 1 A high-resistance faults on 6 km PV strings before they arc to wooden poles. |
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Retrofit replacement of old EM relays—same 1 A/5 A CT ratios and 19" rack size let utilities swap in SPAJ140C during a weekend shutdown, instantly adding event logs and self-supervision without re-wiring panels. |
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